5. Controlling who may post to a list

You can control who posts to your mailing list in several ways. Some options are dependent on each other so combining options in the web interface may not always give exactly what you expect.

Control over posting rights is defined through five options in the Posting panel on the configuration web page (shown below). Changes here affect the workings of four lists, these are: the Subscribers list, the Moderators list, an Allowed Posters list and a Denied Posters list.

Posting configuration panel
The Postings panel has 5 options. Selecting options here modifies the workings of the 4 standard lists (subscribers, moderators, allowed and denied lists).
  1. Posts from addresses other than those in the Allow Posters list will be rejected. This is most useful when you want to limit those who can post to a small group whilst also passing all (un)subscription requests to a separate list of moderators.
  2. Posts to the mailing list from addresses in the Deny Posters list will be rejected.
  3. All posts to the mailing list will be moderated.
  4. Posts from addresses other than moderators will be rejected.
  5. Allow subscribed email addresses to post to the list. Posts from addresses which are not subscribed to the list will be rejected unless they are added to the Allow Posters list.
Select those options you require and save your changes by pressing the Make changes button at the foot of the page.

5.1. Open access

If you do not select any of the Posting options listed above then the list will be completely open to posts by the general public.

5.2. Blocking certain addresses

If you have a mailing list where anyone can post, or possibly posting is limited to subscribers, you may wish to block certain addresses that are continually causing trouble on the list or posting large quantities of unwanted spam mail. In this case you can turn on option 2 above and put their addresses into the Deny Posters list.

This is not a complete solution as it is very easy to obtain a new email address to post from but it can be useful in some situations.

5.3. Subscribers + allowed posters only

Commonly list owners want to limit posts to subscribers only. To setup this configuration select option 5 from the list above. It can be combined with option 2, to deny posting rights for certain members.

In Oxford people often have more than one email address (e.g. a college address and a departmental address). A good working solution to this problem is to add one form into the subscriber list and the other into the Allow Posters list so that the list member does not need to worry about which address they are posting from, either would be accepted by the server. Only the address in the Subscriber list will receive mail from the list.

5.4. All posts moderated

If you need to check all posts to the list before allowing them to be posted you should turn on option 3 in the Postings panel. This means all messages, no matter who they are from, are sent to the moderators. You must specify at least one email address in the moderators list otherwise postings to the list will not be moderated.

For details on how the moderation system works see Moderating messages and requests.

You can also completely block messages from specified users by using the Deny Posters list. In which case posts from those addresses would be silently dropped and not passed onto the moderators.

5.5. Subscribers + others moderated

You may want to allow subscribers to post without any moderation and also allow non-subscribers to post but with moderation to block unwanted messages, such as spam. In this case you should select options 3 and 5 together.

As above, you can also completely block messages from specified users by using the Deny Posters list. In which case posts from those addresses would be silently dropped and not passed onto the moderators

5.6. Moderators only

If your list is intended to be used for announcements only, e.g. a college official mailing list, then you may want to limit posting rights to only those email addresses in the moderators list. If you are not using subscription moderation as well as posting moderation then the moderators will not receive any moderation requests other than for their own messages.

To activate the message moderation system select option 3 and also select option 4 to set up moderator posting only. In this situation the options 2 and 5 will have no effect. This is similar to the Majordomo restrict lists, which creates a small group of allowed posters.

Moderators will be required to self-moderate their posts. This is a security measure to prevent spoofing of email addresses. In self-moderation only the original sender receives a copy of the post instead of all the moderators. Moderation is very simple and is described in Moderating messages and requests.

If you intend to moderate subscriptions as well as posting and you do not want those on your restricted posters list to receive subscription moderation requests then the best solution is to select option 1 instead. See below for details.

5.7. Allowed posters only

This case is similar to the Majordomo restricted poster list. Only those addresses in the Allow Posters list will be able to post to the mailing list.

To set up this situation select options 1, 3 and 4. The configuration system will automatically force options 3 and 4 to be selected if you select option 1 alone.

In this situation those allowed posters will be required to self-moderate their posts to the mailing list as explained in the section above Moderators only. If you turn on subscription moderation those moderation requests will be directed to email addresses in the moderator list rather than the allowed posters list. People on the allowed posters list will not see any moderation requests other than for their own posts as anyone not in the allowed posters list will be blocked.

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